Mortgage Amortization Calculator

Calculate your monthly mortgage payments and view a complete amortization schedule showing how your balance decreases over time. See exactly how much goes to principal vs. interest each month.

Your Mortgage Summary

Monthly Payment
$0
Loan Amount
$0
Total Interest
$0
Total Cost
$0
Payoff Date
-
Total Payments
0

Payment Breakdown

Balance Over Time

Principal vs Interest Per Year

Amortization Schedule

Payment # Date Payment Principal Interest Balance Total Interest

Table of Contents

What is a Mortgage?

A mortgage is a loan specifically designed for purchasing real estate, where the property itself serves as collateral for the loan. When you take out a mortgage, you're agreeing to repay the borrowed amount (principal) plus interest over a specified period, typically 15 to 30 years.

Mortgages are unique because they involve large sums of money spread over long periods, making the way interest is calculated and payments are structured critically important to understand. The total cost of your home can be significantly more than the purchase price once interest is factored in.

Key Components of a Mortgage

Understanding Amortization

Amortization is the process of spreading out a loan into a series of fixed payments over time. With each payment, a portion goes toward the principal (reducing your debt) and a portion goes toward interest (paying the lender for the loan).

How Amortization Works

In the early years of a mortgage, most of your payment goes toward interest because the balance is highest. As you pay down the principal over time, more of each payment goes toward principal and less toward interest. This shift is why an amortization schedule is so valuable—it shows exactly how your payments are applied.

Example: On a $320,000 loan at 6.5% for 30 years, your first payment of $2,023 splits as approximately $1,733 to interest and only $290 to principal. By year 15, the split is closer to 50/50, and by the final years, almost all goes to principal.

Reading an Amortization Schedule

An amortization schedule is a complete table showing each payment throughout the life of the loan. For each payment, it shows:

How to Choose a Mortgage

Selecting the right mortgage involves balancing several factors based on your financial situation and goals:

Consider Your Timeline

Evaluate Monthly Payment vs. Total Cost

Down Payment Considerations

A larger down payment means:

How to Use This Calculator

  1. Enter Home Price: The total purchase price of the property
  2. Enter Down Payment: Either as a dollar amount or percentage of the home price
  3. Enter Interest Rate: Your annual mortgage interest rate (APR)
  4. Select Loan Term: Common options are 15, 20, or 30 years
  5. Set Start Date: When you expect the mortgage to begin
  6. Click Calculate: View your results and amortization schedule

Mortgage Payment Formula

The monthly mortgage payment is calculated using the standard amortization formula:

M = P × [r(1+r)n] / [(1+r)n - 1]

Where:

Breaking Down Each Payment

Once you know the monthly payment, each payment is divided as follows:

Fixed vs. Variable Rate Mortgages

Fixed-Rate Mortgages

With a fixed-rate mortgage, your interest rate stays the same for the entire loan term. This means your principal and interest payment never changes, making budgeting predictable.

Adjustable-Rate Mortgages (ARMs)

ARMs have an interest rate that changes periodically based on market conditions. They typically start with a lower rate that adjusts after an initial fixed period.

Common ARM Types: A 5/1 ARM has a fixed rate for 5 years, then adjusts annually. A 7/1 ARM is fixed for 7 years. The first number indicates the fixed period, the second how often it adjusts.

Balloon Payment Mortgages

A balloon mortgage features lower monthly payments for a set period (typically 5-7 years), after which the entire remaining balance becomes due in one large "balloon" payment.

How They Work

Payments are calculated as if the loan were amortized over a longer period (like 30 years), but the loan actually comes due much sooner. This creates affordable monthly payments but requires either paying off the loan, refinancing, or selling the property when the balloon payment comes due.

Risks and Considerations

Reverse Mortgages

A reverse mortgage is a special type of loan available to homeowners 62 and older that allows them to convert part of their home equity into cash without selling the home.

How Reverse Mortgages Work

Types of Reverse Mortgages

Tips for Getting the Best Mortgage

Before You Apply

  1. Check Your Credit: Higher scores qualify for better rates
  2. Save for a Larger Down Payment: Aim for 20% to avoid PMI
  3. Reduce Existing Debt: Lower debt-to-income ratio helps qualification
  4. Stabilize Employment: Lenders prefer consistent work history

When Shopping for a Mortgage

  1. Compare Multiple Lenders: Get quotes from at least 3-5 lenders
  2. Look Beyond the Rate: Consider fees, closing costs, and terms
  3. Get Pre-Approved: Shows sellers you're a serious buyer
  4. Lock Your Rate: Rate locks protect you from increases during closing

Understanding Closing Costs

Closing costs typically range from 2-5% of the loan amount and include:

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